Checking IDs of adjacent entities in the mixed mesh test

[joshia5]

In the unit test for mixed mesh, the IDs of adjacent entities returned
from query APIs are checked against known values.

omega_h/src/mixed_test.cpp

Lines 132 to 153 in 466e470

	OMEGA_H_CHECK(tet2vtx.ab2b == LOs({0, 1, 8, 2}));
	OMEGA_H_CHECK(hex2vtx.ab2b == LOs({4, 5, 9, 11, 7, 6, 1, 0}));
	OMEGA_H_CHECK(wedge2vtx.ab2b == LOs({11, 9, 10, 0, 1, 8}));
	OMEGA_H_CHECK(pyram2vtx.ab2b == LOs({8, 1, 9, 10, 3}));
	OMEGA_H_CHECK(tet2edge.ab2b == LOs({0, 22, 20, 1, 3, 6}));
	OMEGA_H_CHECK(hex2edge.ab2b == LOs({13, 9, 18, 12, 14, 15, 23, 19, 16, 5, 0, 2}));
	OMEGA_H_CHECK(wedge2edge.ab2b == LOs({18, 17, 11, 19, 23, 21, 0, 22, 20}));
	OMEGA_H_CHECK(pyram2edge.ab2b == LOs({22, 23, 17, 21, 7, 4, 8, 10}));
	}
	else if (num_vertex == 9) {
	//pyram on hex
	OMEGA_H_CHECK(hex2edge.ab2b == LOs({1, 7, 4, 0, 2, 10, 8, 5, 12, 13, 14, 15}));
	OMEGA_H_CHECK(hex2vtx.ab2b == LOs({0, 3, 2, 1, 5, 8, 7, 6}));
	OMEGA_H_CHECK(pyram2edge.ab2b == LOs({12, 13, 14, 15, 3, 11, 9, 6}));
	OMEGA_H_CHECK(pyram2vtx.ab2b == LOs({5, 8, 7, 6, 4}));
	}
	else if (num_vertex == 7) {
	//tet on wedge
	OMEGA_H_CHECK(tet2edge.ab2b == LOs({9, 10, 11, 3, 8, 6}));
	OMEGA_H_CHECK(tet2vtx.ab2b == LOs({4, 6, 5, 3}));
	OMEGA_H_CHECK(wedge2edge.ab2b == LOs({1, 4, 0, 2, 7, 5, 9, 10, 11}));
	OMEGA_H_CHECK(wedge2vtx.ab2b == LOs({0, 2, 1, 4, 6, 5}));

An open issue is to define a new OMEGA_H_VERIFY in Omega_h_fail.hpp which
prints the values of adjacent entity IDs incase of a mis-match, before failing.